CN105571381A - Control system and method for heat medium water pipe type heat exchanger - Google Patents
Control system and method for heat medium water pipe type heat exchanger Download PDFInfo
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- CN105571381A CN105571381A CN201610070483.1A CN201610070483A CN105571381A CN 105571381 A CN105571381 A CN 105571381A CN 201610070483 A CN201610070483 A CN 201610070483A CN 105571381 A CN105571381 A CN 105571381A
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- heat medium
- medium water
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- flue gas
- regulating valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a control system for a heat medium water pipe type heat exchanger. The control system comprises flue gas coolers, a flue gas heater, a heat medium water-filling tank, heat medium water pumps, a heat medium water vapor heater, a channel A heat medium water inlet adjusting valve, a channel B heat medium water inlet adjusting valve, a heat medium water bypass adjusting valve and a vapor adjusting valve. The heat medium water-filling tank is connected with the flue gas heater and the heat medium water pumps. The heat medium water pumps are connected with the channel A heat medium water inlet adjusting valve and the channel B heat medium water inlet adjusting valve correspondingly. The channel A heat medium water inlet adjusting valve and the channel B heat medium water inlet adjusting valve are connected with one set of flue gas coolers correspondingly. The two sets of flue gas coolers are connected to the heat medium water vapor heater which is then connected to the flue gas heater. The control system for the heat medium water pipe type heat exchanger has the beneficial effects that the flue gas temperature of outlets of the flue gas coolers can be well controlled to be maintained in a certain range, and the high dust removal efficiency of an electric precipitator is better ensured.
Description
Technical field
Patent of the present invention relates to control system and method, particularly relates to a kind of heat medium water pipe heat exchanger control system and method.
Background technology
For solving coal-burning power plant's ubiquitous " gypsum rain " problem at present, and meet the emission request of flue gas pollutant increasingly stringent better, generally arrange heat medium water pipe heat exchanger, it comprises gas cooler and flue gas heater.It can reach following three objects: before gas cooler is arranged on dry electrostatic cleaner, reduce the flue-gas temperature entering electric cleaner, the temperature controlling to enter electric cleaner under various operating mode maintains in certain scope, ensures the efficiency of dust collection that electric cleaner is higher; After flue gas heater is arranged in wet electrical dust precipitator, by heat medium water medium transferring heat, compared with swinging GGH, smoke spillage can not be caused, better guarantee desulfurization and dust removing effects; Utilized by fume afterheat, lifting enters the flue-gas temperature of chimney, solves " gypsum rain " problem.
In the unit starting stage, ignition of the boiler produces flue gas SO
2, SO
3and flue gas water smoke, if gas cooler and flue gas heater water temperature are lower than flue-gas temperature, gas cooler and flue gas heater tube wall condensation can be caused, corrode, simultaneously because the environment dust concentration residing for gas cooler is higher, easily make that flue dust sticks, dust stratification and fouling, affect heat-transfer surface and worsen.In compressor emergency shutdown process, be similar to the unit starting stage, flue-gas temperature, lower than flue gas dew point temperature, brings corrosion to gas cooler.In the normal course of operation of unit, need the flue-gas temperature of guarantee matchmaker's waterpipe type heat exchanger electric cleaner entrance under various operating mode within the specific limits, need to ensure that the flue-gas temperature of flue gas heater outlet under various operating mode reaches designing requirement, need to ensure the dust stratification that the heat-transfer surface of gas cooler and flue gas heater under various operating mode does not occur to cause because heat exchanger tube wall temperature is low and corrosion.
Summary of the invention
The object of the invention is to overcome prior art deficiency, provide a kind of rational in infrastructure, meet heat medium water pipe heat exchanger control system and the method for requirements.
For achieving the above object, present invention employs following technical scheme:
Heat medium water pipe heat exchanger control system, comprise gas cooler, flue gas heater, heat medium water water supply tank, heating agent water pump, heat medium water steam heater, A channel heat medium water inlet regulating valve, channel B heat medium water inlet regulating valve, heat medium water bypass valve and steam control valve, described heat medium water water supply tank is connected with heating agent water pump with flue gas heater, heating agent water pump connects A channel heat medium water inlet regulating valve and channel B heat medium water inlet regulating valve respectively, A channel heat medium water inlet regulating valve is connected one group of gas cooler respectively with channel B heat medium water inlet regulating valve, two groups of gas coolers are connected to heat medium water steam heater, described heat medium water steam heater is connected to flue gas heater again, heat medium water bypass valve is also provided with between heating agent water pump and heat medium water steam heater.
As preferably: described heat medium water steam heater is provided with vapour source and steam control valve.
The method of this heat medium water pipe heat exchanger control system, comprises the steps:
In the unit starting stage, before ignition of the boiler, the heat medium water in gas cooler and flue gas heater together circulates intensification;
After ignition of the boiler, the heat medium water heating up or enter in flue gas heater heats up to select the heat medium water in gas cooler and flue gas heater together to circulate according to the heating capacity of heat medium water steam heater;
In the unit operation stage, by the aperture of A channel inlet regulating valve and channel B inlet regulating valve and heat medium water bypass valve, control in gas cooler outlet cigarette gentle flue gas heater outlet cigarette temperature scope of design;
In the unit outage stage, by controlling the switch of A channel inlet regulating valve and channel B inlet regulating valve and heat medium water bypass valve, until boiler flameout.
As preferably: by A channel inlet regulating valve, channel B inlet regulating valve and heat medium water bypass valve, heat medium water flow is regulated to control at certain temperature range by the flue-gas temperature that gas cooler exports; In unit underload situation, regulated the magnitude of recruitment of auxiliary steam by steam control valve, control flue gas heater exit gas temperature reaches design load or controls gas cooler leaving water temperature and reaches design load.
The invention has the beneficial effects as follows:
The flue-gas temperature that 1, well can control gas cooler outlet under the various operating condition of unit maintains in certain scope, better ensures the efficiency of dust collection that electric cleaner is high.
2, under the various operating condition of unit, can ensure that the cigarette temperature that flue gas heater exports reaches designing requirement.
3, under the various operating condition of unit, at utmost ensure the tube wall temperature of heat medium water pipe heat exchanger, avoid condensation and the corrosion of gas cooler and flue gas heater pipe wall of heat exchange pipe.
4, can avoid that the flue dust come because of the environment dust concentration higher band residing for gas cooler sticks, dust stratification and fouling, affect heat-transfer surface and worsen.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Description of reference numerals: heat medium water water supply tank 1, heating agent water pump 2, A channel heat medium water inlet regulating valve 3, channel B heat medium water inlet regulating valve 4, heat medium water bypass valve 5, gas cooler 6, heat medium water steam heater 7, flue gas heater 8, vapour source 9, steam control valve 10.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.The explanation of following embodiment just understands the present invention for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
The heat medium water pipe heat exchanger of the present embodiment is except gas cooler 6 and flue gas heater 8, be made up of following accessory system: heat medium water water charging system, capital equipment comprises heat medium water water supply tank 1, the heat medium water circulatory system, capital equipment comprises heating agent water pump 2, heat medium water steam heated system, capital equipment comprises heat medium water steam heater 7 and corresponding regulable control valve, mainly comprises the compositions such as A channel heat medium water inlet regulating valve 3, channel B heat medium water inlet regulating valve 4, heat medium water bypass valve 5 and steam control valve 10.
1 system signal with reference to the accompanying drawings, in the different phase of unit starting, operation and stoppage in transit, different control models taked by heat medium water pipe heat exchanger.
In the unit starting stage, unit air-introduced machine completes heat medium water pipe heat exchanger upper water conservancy project before starting is done.Preheating heat medium water before ignition of the boiler, carries out tube wall intensification to gas cooler 6 and flue gas heater 8.Before ignition of the boiler, the heat medium water in gas cooler 6 and flue gas heater 8 together circulates intensification, and now to export water temperature relatively minimum for gas cooler 6, makes this water temperature higher than flue gas acid dew point, can control the heating agent water temperature lower limit of whole system well.By standard-sized sheet A channel inlet regulating valve 3 and channel B inlet regulating valve 4, complete shut-down heat medium water bypass valve 5, heat medium water bypass valve 5 exports heat medium water temperature according to gas cooler 6 and adjusts gradually and follow the tracks of, until temperature reaches design load.After ignition of the boiler, when flue-gas temperature is lower, will there is heat exchange in heat medium water and flue gas, flue gas will take away partial heat, when the heating capacity of heat medium water steam heater 7 is enough, adopt gas cooler 6 and flue gas heater 8 to circulate intensification simultaneously; Have in limited time at the heating capacity of heat medium water steam heater 7, gas cooler 6 is isolated, ensures the tube wall temperature of flue gas heater 8, now to export water temperature relatively minimum for flue gas heater 8, this water temperature should be made higher than flue gas acid dew point, can control heat medium water temperature lower limit well.By complete shut-down A channel inlet regulating valve 3 and channel B inlet regulating valve 4, standard-sized sheet heat medium water bypass valve 5, and export water temperature according to flue gas heater 8 and adjust the aperture of heat medium water bypass valve 5 gradually and follow the tracks of, until temperature reaches design load.
At unit normal operating phase, gas cooler 6 and flue gas heater 8 heat medium water have been warming up to normally all.Gas cooler 6 exports cigarette temperature and rises, then open large A channel inlet regulating valve 3 and channel B inlet regulating valve 4, turn down heat medium water bypass valve 5; Gas cooler 6 exports cigarette temperature and declines, then turn down A channel inlet regulating valve 3 and channel B inlet regulating valve 4, open large heat medium water bypass valve 5, major control gas cooler 6 exports cigarette temperature in design load scope.Flue gas heater 8 exports cigarette temperature and rises, then turn down steam control valve 10; Otherwise anti-then, control flue gas heater 8 export cigarette temperature in scope of design.
In the unit outage stage, standard-sized sheet heat medium water bypass valve 5, complete shut-down A channel inlet regulating valve 3 and channel B inlet regulating valve 4, heating agent water pump 2 runs, and keeps the circulation of other system except gas cooler 6.Increase steam control valve 10 aperture, flue gas heater 8 heat medium water is incubated by Steam Heating, and gas cooler 6 heat medium water then synchronously declines, until boiler flameout with cigarette temperature.In the stages of not stopping transport such as generator set desulfurization absorption tower recirculation pumps, control flue gas heater 8 and export heating agent water temperature higher than flue gas dew point temperature.The non-ignition phase of boiler in air flowing, keeps flue gas heater 8 to export heat medium water temperature a little more than flue-gas temperature.
1 system signal by reference to the accompanying drawings, to heat medium water pipe heat exchanger system, mainly take following control thinking:
By A channel inlet regulating valve 3, channel B inlet regulating valve 4 and heat medium water bypass valve 5, heat medium water flow is regulated to control at certain temperature range by the flue-gas temperature that gas cooler exports; In unit underload situation, regulated the magnitude of recruitment of auxiliary steam by steam control valve 10, control flue gas heater 8 exit gas temperature reaches design load or controls gas cooler 6 leaving water temperature and reaches design load.The design of the native system configuration logic mainly regulating loop of 4 control valves.Be expressed as follows respectively:
Heat medium water bypass valve 5:
As the first regulable control of gas cooler 6, mainly control the maximum caloric receptivity that gas cooler 6 can be accomplished, namely when A channel inlet regulating valve 3 and channel B inlet regulating valve 4 standard-sized sheet, gas cooler 6 reaches maximum caloric receptivity.Its aperture setting follow following principle: unit at full capacity time, heat medium water bypass valve 5 complete shut-down, can export fibre selection below flue gas dew point temperature by gas cooler 6.During minimum load, A channel inlet regulating valve 3 and channel B inlet regulating valve 4 complete shut-down, heat medium water bypass valve 5 standard-sized sheet, makes gas cooler 6 export cigarette temperature and remains on more than flue gas acid dew point temperature.Because the control object of A channel inlet regulating valve 3 and channel B inlet regulating valve 4 is also that gas cooler 6 exports cigarette temperature, " intersect confusion " phenomenon for avoiding occurring that A channel inlet regulating valve 3 and channel B inlet regulating valve 4 occur with heat medium water bypass valve 5, when the initial stage of carrying out debugs, the valve position of heat medium water bypass valve 5 regulates with unit load is foundation.
A channel inlet regulating valve 3 and channel B inlet regulating valve 4:
As the second regulable control of gas cooler 6, mainly control unit gas cooler 6 under different load operating mode and export cigarette temperature in reasonable interval, relative first regulates more meticulous.When its adjustment can not meet system condition, heat medium water bypass valve 5 need be coordinated to regulate gas cooler performance.
A channel inlet regulating valve 3 and channel B inlet regulating valve 4 mainly export the closed-loop adjustment of cigarette temperature with gas cooler 6, by regulating the aperture of A channel inlet regulating valve 3 and channel B inlet regulating valve 4, ensure that gas cooler 6 exports cigarette temperature and reaches design load.The hysteresis regulated for avoiding whole system, adds unit load simultaneously and gas cooler 6 exports the temperature difference of cigarette temperature measured value and setting value as feedforward.
Steam control valve 10:
In the different phase of unit load, steam control valve 10 exports cigarette temperature according to flue gas heater 8, flue gas heater 8 exports water temperature, heat medium water steam heater 7 inlet water temperature adopts different controlled plants.Major design 3 closed-loop adjustment: export the closed-loop adjustment of cigarette temperature with flue gas heater 8, it is mainly through steam regulation control valve 10 aperture, ensure that flue gas heater 8 exports cigarette temperature and reaches design load, the closed-loop adjustment of water temperature is exported with gas cooler 6, it is mainly through steam regulation control valve 10 aperture, ensures that gas cooler 6 exports water temperature and reaches design load; Export the closed-loop adjustment of water temperature with flue gas heater 8, it is mainly through steam regulation control valve 10 aperture, ensures that flue gas heater 8 exports water temperature and reaches design load.
The present invention applies at Zhejiang Zhe Nengjiahua electricity generating corporation, Ltd #3 unit ~ #8 unit, and control effects is good.
Claims (4)
1. a heat medium water pipe heat exchanger control system, it is characterized in that: comprise gas cooler (6), flue gas heater (8), heat medium water water supply tank (1), heating agent water pump (2), heat medium water steam heater (7), A channel heat medium water inlet regulating valve (3), channel B heat medium water inlet regulating valve (4), heat medium water bypass valve (5) and steam control valve (10), described heat medium water water supply tank (1) is connected with heating agent water pump (2) with flue gas heater (8), heating agent water pump (2) connects A channel heat medium water inlet regulating valve (3) and channel B heat medium water inlet regulating valve (4) respectively, A channel heat medium water inlet regulating valve (3) and channel B heat medium water inlet regulating valve (4) are connected one group of gas cooler (6) respectively, two groups of gas coolers (6) are connected to heat medium water steam heater (7), described heat medium water steam heater (7) is connected to flue gas heater (8) again, heat medium water bypass valve (5) is also provided with between heating agent water pump (2) and heat medium water steam heater (7).
2. heat medium water pipe heat exchanger control system according to claim 1, is characterized in that: described heat medium water steam heater (7) is provided with vapour source (9) and steam control valve (10).
3. the method for heat medium water pipe heat exchanger control system according to claim 1, is characterized in that: comprise the steps:
In the unit starting stage, before ignition of the boiler, the heat medium water in gas cooler (6) and flue gas heater (8) together circulates intensification;
After ignition of the boiler, the heat medium water heating up or enter in flue gas heater (8) heats up to select the heat medium water in gas cooler (6) and flue gas heater (8) together to circulate according to the heating capacity of heat medium water steam heater (7);
In the unit operation stage, by A channel inlet regulating valve (3) and channel B inlet regulating valve (4) aperture with heat medium water bypass valve (5), control in gas cooler (6) outlet cigarette gentle flue gas heater (8) outlet cigarette temperature scope of design;
In the unit outage stage, by controlling the switch of A channel inlet regulating valve (3) and channel B inlet regulating valve (4) and heat medium water bypass valve (5), until boiler flameout.
4. the method for heat medium water pipe heat exchanger control system according to claim 3, it is characterized in that: by A channel inlet regulating valve (3), channel B inlet regulating valve (4) and heat medium water bypass valve (5), regulate heat medium water flow to control at certain temperature range by the flue-gas temperature that gas cooler exports; In unit underload situation, regulated the magnitude of recruitment of auxiliary steam by steam control valve (10), control flue gas heater (8) exit gas temperature reaches design load or controls gas cooler (6) leaving water temperature and reaches design load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610070483.1A CN105571381B (en) | 2016-02-01 | 2016-02-01 | A kind of heat medium water pipe heat exchanger control system and method |
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|---|---|---|---|
| CN201610070483.1A CN105571381B (en) | 2016-02-01 | 2016-02-01 | A kind of heat medium water pipe heat exchanger control system and method |
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| CN105571381A true CN105571381A (en) | 2016-05-11 |
| CN105571381B CN105571381B (en) | 2018-08-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106277271A (en) * | 2016-08-26 | 2017-01-04 | 浙江天地环保科技有限公司 | A kind of tubular type heat medium water heat-exchange system chemicals dosing plant and control method thereof |
| CN106440859A (en) * | 2016-08-26 | 2017-02-22 | 浙江天地环保科技有限公司 | Heat exchanger smoke temperature automatic adjusting system and control method |
| CN107023815A (en) * | 2017-04-25 | 2017-08-08 | 广东电网有限责任公司电力科学研究院 | The temprature control method of the indirect flue gas heat-exchange unit of 600MW coal-burning boilers |
| CN107166417A (en) * | 2017-07-10 | 2017-09-15 | 都江电力设备厂 | A kind of new MGGH systems minimum wall temperature control method and system |
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| CN106277271A (en) * | 2016-08-26 | 2017-01-04 | 浙江天地环保科技有限公司 | A kind of tubular type heat medium water heat-exchange system chemicals dosing plant and control method thereof |
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| CN107166417A (en) * | 2017-07-10 | 2017-09-15 | 都江电力设备厂 | A kind of new MGGH systems minimum wall temperature control method and system |
| CN107166417B (en) * | 2017-07-10 | 2023-04-14 | 中国电建集团都江电力设备有限公司 | Minimum wall temperature control method and system for MGGH system |
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| CN105571381B (en) | 2018-08-14 |
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Address after: Hangzhou City, Zhejiang province 310012 Huaxing Road No. 99 (Hangzhou Neusoft business building) Patentee after: Zhejiang Tiandi Environmental Protection Technology Co., Ltd Address before: Hangzhou City, Zhejiang province 310012 Huaxing Road No. 99 (Hangzhou Neusoft business building) Patentee before: ZHEJIANG TIANDI ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |